tiva(stellaris)/lpc: Use directory structure as stm32

EDIT: Whitespace changes to the files stripped out.

examples/tiva/lm4f/stellaris-ek-lm4f120xl/usb_to_serial_cdcacm/README

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+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example demonstrates the following:
+ * Using the USB controller
+ * Setting up a simple usb to serial converter (CDCACM)
+
+File list:
+ * usb_cdcacm.c - implementation of the CDCACM subclass
+ * uart.c - implementation of UART peripheral
+ * usb_to_serial_cdcacm.c - glue logic between UART and CDCACM device
+ * usb_to_serial_cdcacm.h - common definitions
+
+
+Implements a USB-to-serial adapter, compliant to the CDCACM subclass. UART1 is
+used for the TX/RX lines. Although UART1 also has lines for flow control, they
+are not used. Instead, the control lines are implemented in software via GPIOA.
+
+The following pinout is used:
+	Tx  <-  PB1
+	Rx   -> PB0
+	DCD  -> PA2
+	DSR  -> PA3
+	RI   -> PA4
+	CTS  -> PA5 (UNUSED)
+	DTR <-  PA6
+	RTS <-  PA7
+
+Note that the CTS pin is unused. The CDCACM specification does not define a way
+to control this pin, nor does it define a way to switch between flow control
+mechanisms.
+
+The glue logic in usb_to_serial_cdcacm.c receives requests from both the UART
+and CDCACM interface, and forward them to their destination, while also
+controlling the LEDs
+
+The green LED is lit as long as either DTR or RTS are high.
+The red LED is lit while the UART is sending data.
+The blue LED is lit while data is read from the UART.
+The red and blue LEDs will only be lit for very short periods of time, thus they
+may be difficult to notice.
+
+------------------------------------------------------------------------------
+Windows Quirks
+------------------------------------------------------------------------------
+On openening the CDCACM port Windows send a SET_LINE_CODING request with the
+desired baud rate but without valid databits. To run this example CDDACM device
+under Windows you have to return always 1 when a SET_LINE_CODING request is
+received. The following code should work:
+
+File: usb_cdcacm.c
+Function: cdcacm_control_request()
+
+	case USB_CDC_REQ_SET_LINE_CODING:{
+			struct usb_cdc_line_coding *coding;
+
+			if (*len < sizeof(struct usb_cdc_line_coding))
+			{
+				return 0;
+			}
+
+			coding = (struct usb_cdc_line_coding *)*buf;
+			glue_set_line_coding_cb(coding->dwDTERate,
+						coding->bDataBits,
+						coding->bParityType,
+						coding->bCharFormat);
+			return 1;